Uses TLS 1.2 as the default for EAP-TLS negotiation. You can change this default setting with a configuration profile. Older clients might still need 1.0.

Sharing on APFS drives

AFP can’t share files on Apple File System (APFS). Apple File System (APFS) is the default file system in macOS High Sierra for Mac computers with all-flash storage. You can't opt out of the transition to APFS when you upgrade a Mac with all-flash storage to macOS High Sierra. Learn more about APFS in macOS High Sierra.

If you need to share files, switch to SMB. If you have network home directories shared via AFP on an APFS volume, update the mount records and user records to use SMB.

Kernel extensions

macOS High Sierra introduces a feature that requires user approval before loading new third-party kernel extensions. This feature requires changes to some apps and installers in order to preserve the desired user experience.

You won't be able to run Content Caching on a virtual machine. This action has never been supported in previous versions of macOS, but is explicitly disallowed in macOS High Sierra.

Configuration Profiles

In macOS High Sierra, /var/db/ConfigurationProfiles is now protected by SIP. Admins should now use the profiles(1) command to install startup configuration profiles. See the profiles(1) manual page for more information.

Changes introduced in macOS Server 5.4

File sharing with iOS devices

You won’t be able to set up file sharing with iOS devices in macOS Server 5.4. Use collaboration for Pages, Numbers, and Keynote or WebDAV sharing as an alternative for file sharing with iOS devices.
If you want to configure WebDAV sharing on a Mac with macOS Server 5.4, see the wfsctl(8) manual page.

FTP

macOS Server 5.4 removes the FTP service when you upgrade. If you need to use File Sharing, go to System Preferences > Sharing.

File Sharing

All File Sharing functionality has moved to macOS High Sierra. AFP will be deprecated in macOS Server 5.4 and you won’t be able to share files on an APFS volume. Use SMB to share files on an APFS volume, or use AFP to share files on an attachedHFS+ volume.

If you upgrade a Mac that is sharing network home directories via AFP to macOS High Sierra, the AFP service will be disabled. You must update your network user share point URL to use SMB instead of AFP.

Open Directory service is hidden in new installations of macOS Server 5.4. Open Directory isn’t required to use new instances of Profile Manager.

Caching

In macOS High Sierra and macOS Server 5.4, the Caching service moves out of macOS Server and into System Preferences > Sharing > Content Caching. The new Content Caching service supports tethered clients and a tiered architecture. Option-click the Options button in System Preferences > Sharing > Content Caching to see the advanced configurations.